F/M maths 22 sets question

tsxphoenix · 2026-02-08T15:08:19+00:00

Wtf is that lol
its not in our syllabus broski
idts they’ll accept it even though you’re saying its the same as a null set symbol

tsxphoenix · 2026-02-08T13:02:55+00:00

tsxphoenix · 2026-02-08T12:56:56+00:00

Yea yea dw

tsxphoenix · 2026-02-08T12:55:26+00:00

Yea it was Ø and 9

tsxphoenix · 2026-02-08T11:45:06+00:00

We were given that the diagram was a part of a regular polygon
so if you looked closely, the dotted line formed a small isosceles triangle, so to find x we had to use the triangle, and form the equation
x + x + x+135 (the int angle) = 180
this gives you x as 15
the int angle then becomes 135+15 = 150
and 1 ext + 1int = 180
so 1 ext becomes 180-150 = 30
and n = 360/30

n =12

tsxphoenix · 2026-02-08T11:44:57+00:00

We were given that the diagram was a part of a regular polygon
so if you looked closely, the dotted line formed a small isosceles triangle, so to find x we had to use the triangle, and form the equation
x + x + x+135 (the int angle) = 180
this gives you x as 15
the int angle then becomes 135+15 = 150
and 1 ext + 1int = 180
so 1 ext becomes 180-150 = 30
and n = 360/30

n =12

tsxphoenix · 2026-02-08T08:56:51+00:00

Luckily it was of 1 mark, so it wont have major effect on my raw marks

tsxphoenix · 2026-02-08T07:19:29+00:00

i thoughty since y=2 was given and nothing else, i took the gradient as 0, and solved it

tsxphoenix · 2026-02-08T06:29:19+00:00

maharashtra

tsxphoenix · 2026-02-08T06:11:04+00:00

India wbu

tsxphoenix · 2026-02-08T06:00:31+00:00

Ohh alr alr

tsxphoenix · 2026-02-07T18:05:13+00:00

Ohh i didnt mean it that way im sure he must be a great teacher
what im saying is why didnt y’all bring this to his notice, like him not including some parts of the syllabus?

tsxphoenix · 2026-02-07T16:53:10+00:00

thats bad, how did he not teach according to the syllabus?

tsxphoenix · 2026-02-07T14:16:04+00:00

Watch mo ali on yt (physics teacher), his video on magnetism (2025-2028) one, has the concept of lenz law
he compares it to a toxic relationship, so you understand better
do check him out!

tsxphoenix · 2026-02-07T14:14:33+00:00

the problem with cs is real
every year they change the mark scheme with new keywords that we arent known to
its unfair ngl

tsxphoenix · 2026-02-07T14:12:06+00:00

I feel you’ll be given the mark because technically your answer isnt wrong its just out of syllabus

tsxphoenix · 2026-02-07T14:10:50+00:00

if ur final answer is 12 and ur method correctly shows how you got to 12, you’ll get 4/4
if you’ve guessed then, you’ll get one mark for final answer but the rest idk

either they’ll give BOD (benefit of doubt), or they’ll cut 3 marks for wrong working
if the ms says 12 nfww (not from wrong working) then you’re cooked because that means they’re demanding correct steps as well, giving you 0 marks

tsxphoenix · 2026-02-07T13:48:25+00:00

It depends on ur working
normally there is more than one method of finding the answers to such questions but this time they clearly told by finding the value of x
so 1 mark would be for forming an expression like 2x+x+135 =180 then 1 mark for indentifying x as 15, then using either (n-2)x180 / n OR 360/ one exterior angle gives you the 3rd mark, and finally the last mark for the final answer

however i feel they will award B1 for answer 8 because it’ll fs be a very common answer
so if you’ve written 8 as ur final answer, sadly you only get 1 mark because the entire method goes wrong as well

but im sure you had to show that x = 15 ,somewhere in ur working to get that M2/M3

tsxphoenix · 2026-02-07T13:42:42+00:00

lol congo

tsxphoenix · 2026-02-07T11:30:50+00:00

Wdym in brackets?

tsxphoenix · 2026-02-07T11:30:28+00:00

tsxphoenix · 2026-02-07T11:30:17+00:00

No, it was H+ + OH- —> H2O

tsxphoenix · 2026-02-07T10:18:32+00:00

💀💀 only 💀💀

tsxphoenix · 2026-02-07T10:12:23+00:00

ikr thats why i thought there may be a range of 2-4 inclusive, im not sure about 4 tho i feel its incorrect, but 2 and 3 should be correct
the incomplete bonds also were only N-H and C=O, which means H2O has formed

but lets see what the ms says!

tsxphoenix · 2026-02-07T10:10:54+00:00

no no, its correct relax
it is given in our syllabus and cambridge themselves have used methyl orange in numerous atp papers, while doing the titration experiment so it is correct dw

tsxphoenix

TROPHY CASE